ok so i dont know the first thing about crossbows, i shoot a compound. but my dad shoots a crossbow, horton legend 2 i think is what its called with 175lb pull. in short, the xbow will shoot a decent group one time and the next you could fit a ruler between the arrows. im inclined to think that his arrows arent flying right or the broadheads arent tuned or something to that effect, but he has had the same problem with a couple sets of different arrow/broadhead combonations.

can anyone give me somefeed back on how to get this thing to shoot consistant groups??